Stamp-stem guide.



J. A. LITTLE.

STAMP STEM GUIDEe APPLICATION FILED APR.3,1914,

1, 1 27,653. Patented Feb. 9, 1915.

V WITNESSES: N INVFEN'IOR W 95 Qjz'fi, 1 v l 7 BY I V THE NORRIS PETERS CO4. FHOTO-LIIIHQ. WASHINGTON, D. C.

WTTED @TATES PATENT @FFTQE.

JAMES A. LITTLE, OF RANDSBURG, CALIFORNIA.

STAMP-STEM GUIDE.

Application filed April 3, 1914.

T 0 aZZ whom it may concern Be it known that 1, JAMES A. LITTLE, a citizen of the United States, residing at Ptandsburg, in the county of Kern and State of California, have invented new and useful Improvements in Stamp-Stem Guides, of which the following is a specification.

This invention relates to stamp stem guides for use in stamp mills.

The object of the present invention is to provide a simple, practical stamp stem guide which will do away with all machining of the key seat and will insure a snug fit of the parts which guide the stamp stem, with no chance for play between these holding parts; which will have no bolts to work or jar loose; which will have means for keeping the shell or bushing in which the stem slides from following down the stem, and which when once put in position and properly set up will need no future adjustment.

Mill operators have met with considerable practical difficulty with the guides commonly on the market by not having their stamps and stamp stems properly mounted, due to the terrific vibration incident to the constant dropping of the heavy stamps. Tt has been common to use bushings or shells in which the stems slide, but due to wear they frequently work loose from their guide blocks and gradually work down the stem or become detached from their bearings. Where adjusting shims or bolts are used further difliculty is met by their constantly working loose and shifting from position. The present invention meets these difiiculties as has been proven by the practical successful use to which it has been put under severest tests of operation.

The invention consists of the parts, and the combination and construction of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, in which Figure 1 is a plan of a guide block adapted for a battery of five stamps. Fig. 2 is a front elevation of a portion of a guide pertaining to one stamp. Fig. 3 is a vertical section of a portion of the device shown in Fig. 2.

A represents a guide block which is preferably of metal and adapted to be secured to suitable timbering sufficient to sustain the weight and strain to which the device is subjected in use. In the present instance I Specification of Letters Patent.

Patented Feb. 9, 1915.

Serial No. 828,388.

have shown the block A as designed to receive a battery of five stamp stems, 2, but it is manifest that it is adapted for one or more. This block A has a vertical bore of sufficient size to receive a bushing 3, which is internally machined to provide a smooth bore in which the stem 2 may slide. This bushing 3 may be made integral or split, as here shown; the essential feature of the bushing being the outwardly projecting annular flange 4 at its upper end, which is adapted to rest on the block when the bushing is in place.

To one side of the wall of each chamber in the block in which a bushing 8 is set, is a pocket closed at the top and bottom and open in the front and rear to receive a gib 5. This gib 5 has its face adjacent to the bushing 3 transversely concaved and vertically disposed to bear against the periphery of the bushing 8. Back of the gib is formed a vertical key-way to receive a locking wedge key 7. The rear vertical wall of the keyway is convexed verticallv, as shown at 8, so as to provide practically only one point of bearing for the back of the key whereby the front tapered face 9 of the key will always fit snug against the corresponding back of the gib 5. This arcuate bearing 8 is important as it does away with the need of all machining of the key-wav and furthermore, insures a snug fit of the key against the gib with no chance for play between the key and gib. The keys do not have to be made true to bevel. because the single point hearing at the back of the key necessitates the key engaging flat against the whole length of the gib. This has the effect of holding the nib and the bushing in line with the shaft. The only machining about any of the parts is the inside and outside turning of the bushing 3 to provide a frictionless sliding fit with the stem 2, and the socket and back of the block.

The flange 4 at the upper end of the bushing is important as it prevents the bushing falling through the guide block.

By this construction there are no bolts or other parts to work or jar loose. Whenever a bushing is worn out, a key is easily removed: the gib backed up, the bushing lifted and the stem removed from the guide block through the openings 10, provided for that purpose.

This application is in substitution and continuation in part of my original application Serial No. 676,788, filed on or about February 10, 1912.

Having thus described my invention, what'I claim and desire to secure by Letters Patent is 1. In combination with a stem, and a block having a vertical bore, and a bushing in the bore, a pocket to one side of the bore having top and bottom Walls and open front and rear portions, a gib in the pocket engaged at its ends with said top and bottom walls of the pocket and having a concave front face which projects beyond the front portion of the pocket and engages the bushing and having a straight rear face which extends beyond the'rear portion of the pocket, a vertical keyway located beyond the rear portion of the pocket, said keyway having a rear vertical wall which is convexed vertically to provide a central onepoint bearing, and a Wedge-shaped key in the key way having its rear face engaged with said one-point bearing and having its front face engaged with the straight rear ]face of the gib throughout the length of the atter. i

2.1n combination with a stem, and a block having a vertical bore, and a bushing in the bore, a pocket to one side of the bore, a gib in the pocket bearing against the bushing, means independent of the bushing to hold the gib against vertical movement, a keyway to the rear of the pocket having a central single point bearing, and a means in the keyway engaged with the single point bearing and with the gib to force the gib toward the bushing.

In combination with a stem, and a block having a vertical bore, and a bushing in the bore, a pocket to one side of the bore, a gib in the pocket, said pocket having upper and lower walls which engage the respective ends of the gib to hold the latter against vertical movement with respect to the block, a central single point bearing to the rear of the gib, and a key engaged with said single point bearing and with the gib to force the latter against the bushing.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses. 1

JAMES A. LITTLE.

Witnesses:

PAUL T. WILSON, JOHN W. MCLEOD.

Copies 01 this patent maybe obtained for five cents each. by addressing the Commissioner of Patents. Washington, D. G. 

